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Topic: wood moisture content (Read 136 times)

qizhen0926
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wood moisture content
« on: Jan 18^th, 2016, 11:04pm »

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Equilibrium moisture content of the wood with changes in their environment in which the temperature and humidity changes, when the equilibrium moisture content and humidity there is a difference, it will tend to be close to the environment. This leads to swelling and shrinkage of wood phenomenon, which is peculiar physical phenomenon timber. Typically, when we are low composite fence timberwolf, moisture content of wood is a standard can not be ignored.
Wood moisture contained in three forms, one is present in the cell chamber and the water in the intercellular spaces, is present in the capillary water, called free water. The second cell wall is absorbed by the water, called the adsorbed water. The third is a tissue composed of water, called chemical water.
When wet wood moisture evaporates, the first loss of the free water, free water when complete evaporation of adsorbed water is still in the moisture content of saturated when called fiber saturation point moisture content.
Performance wood fiber saturation point is a turning point, above the fiber saturation point, strength of the timber is constant, it does not change with changes in moisture content. At the same time there is no expansion of non slip paint for composite decking. When the moisture content falls below the fiber saturation point, which is when the cell wall of the adsorbed water begins to evaporate, strength decreased with increasing moisture content, shrinkage and swelling phenomena obviously presented. Different moisture content of the wood fiber saturation point between about 22% to 33%.
All regions relatively stable humidity and temperature in different seasons have nature. Wood is located in the relatively long time temperature and humidity environment, the moisture content will reach a relatively constant. This time, the moisture content is called the equilibrium moisture content (for example, in the Shanghai area equilibrium moisture content of 4.6%).
Equilibrium moisture content of the wood with changes in their environment in which the temperature and humidity changes, when the equilibrium moisture content and humidity there is a difference, it will tend to be close to the environment. This leads to swelling and shrinkage of wood phenomenon, which is peculiar physical phenomenon timber.
Wood is an anisotropic body. Its actual use of the wood moisture content in sauna wpc floor prices, so moisture gains and losses are mainly the cell wall of the adsorbed water. The vast majority of timber longitudinal growth of the cells, which are the expansion and contraction and cell wall perpendicular to the direction. As a piece of the floor, we can find it generally no longitudinal expansion and contraction and expansion in the width direction shrinkage is generally 3% to 6% (mean wood moisture content at the fiber saturation point change in moisture content below).
Thus, controlling the moisture content of a good floor is very important. We must pay attention not only production, but also should pay attention to in the laying of the floor to prevent moisture deformation.

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